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Mr. Himanshu H. Mehta, P.E. 7 July 2014 Page 3 Task 3 — Field Activities: Field activities will include: shallow soil sampling and a LFG investigation. The sampling activities will be designed to focus on the 25 acres in the southwestern part of the County-owned portion of the Site. The general sampling plan will be designed on a grid pattern and final sampling locations may be selected in the field based on observations. The sampling plan is designed to extend the assessment that was completed on the other 30 acres of the Site such that the same assessment scope will be completed across the entire IRC-owned portion of the Site. The 25 acre assessment area is wooded with limited access. It has been assumed that some land clearing will be necessary prior to completion of the activities described below and that IRC personnel will complete the clearing work. No budget for land clearing (other than limited hand clearing and limited budget for field personnel to mark areas that need clearing) has been included and it has been assumed (based on site-specific experience) that proposed fieldwork can be performed in level D personal protective equipment(PPE). Subtask A. Shallow Soil Sampling This subtask includes the performance of hand auger soil borings to 2 ft below land surface (BLS) on an approximate 200-ft grid, focusing on specific areas of the Site as outlined previously. Shallow soil samples will be collected from 0 to 0.5 ft BLS and 0.5 to 2 ft BLS at up to 19 locations. If waste is encountered at a depth shallower than 2 ft BLS, sampling will be discontinued (i.e., samples of waste material will not be collected for analysis). The collected soil samples will be submitted for laboratory analysis of semi-volatile organic compounds (SVOCs) by USEPA Method 8270 or similar and Resource Conservation Recovery Act(RCRA) Metals by USEPA Method 6010. In addition, a subset (approximately 25% of the total samples analyzed) of the soil samples will be analyzed for volatile organic compounds (VOCs) by USEPA Method 8260, organochlorine pesticides by USEPA Method 8081, organophosphorus pesticides by USEPA Method 8141, and herbicides by USEPA Method 8151. Three equipment blanks will be collected for QA purposes with laboratory analyses for VOCs and metals. Budget has been included for analysis of up to a total of 38 samples for this portion of the sampling work, plus the three QA samples (total of 41 soil samples). In addition, budget has been included for collecting confirmation and delineation samples at the three locations that exhibited concentrations above state regulatory criteria during the first phase of work (SB100, SB109, and SB111). At each of these three locations, soil samples will be collected at 0 to 0.5 ft BLS and 0.5 to 2 ft BLS adjacent to the previous sample location. Also at each location, soil samples will be collected in those same depth intervals at 5 ft and 10 ft stepouts in each cardinal direction (three confirmation samples and 24 delineation samples). The soil samples will be analyzed only for the constituents that were observed above state regulatory criteria during the previous assessment work. The samples around SBI 11 will be analyzed only for arsenic and all of these proposed soil samples will be analyzed for PAHs by USEPA 8270 or similar. The samples will be collected during a single mobilization but will be analyzed by the laboratory in phases. Confirmation samples will be analyzed by the laboratory first and if the XR14096AR14053-REV.doex engineers I scientists I innovators